Hey Solix, huge congrats on finishing your very first project! Getting a game fully done and playable in the browser is a massive milestone in itself, so be proud of that.
Since you asked for blunt and honest feedback to improve, here is my take from a fellow dev's perspective:
1 & 2 (Playtime & Frustrations): I played it for a bit to get a feel for the core loop. I actually agree with what u_capricorn_studioz mentioned above. In simple top-down shooters, getting hit can sometimes feel a bit sudden if there aren't strong visual cues.
3 (Controls): The controls and the core idea are very straightforward. You didn't overcomplicate it, which is the smartest thing you can do for a first project. No confusion there!
6 (If I could change ONE thing): Coming from someone who spends a lot of time designing 2D assets and UI, I'd highly recommend adding a bit more "juice" to the game. Adding simple hit flashes (making enemies blink white when hit), screen shake, or tiny particle effects when shooting/destroying enemies makes the combat feel 10x more satisfying.
Overall, you've built a really solid foundation here. Don't worry about it being too simple—every indie dev starts exactly like this. Keep building, tweaking, and learning! Best of luck with your next updates.